quota deadlock on 6.1-RC1

[Kris Kennaway]

On Sat, May 06, 2006 at 08:54:34PM +0100, Robert Watson wrote:
> 
> On Sat, 6 May 2006, Chris wrote:
> 
> >are snapshots a default setting?
> 
> In case people want to avoid using snapshots, here are the uses I'm 
> currently aware of in the base system:
> 
> - Background file system check uses snapshots.  This can be disabled by 
> using
>   background_fsck="NO" in /etc/rc.conf.
> 
> - dump uses snapshots if the -L paramater is specified, in order to take an
>   atomic backup of the system.  It won't use snapshots unless explicitly
>   specified.
> 
> - mksnap_ffs uses snapshots, as it's the operator snapshot creation tool.
> 
> FWIW, I and a moderate number of other people use snapshots daily on quite 
> busy and over-burdened machines without problems.
> 
> Also, as an FYI, several quota-related snapshot fixes went into CVS in the 
> last 24-48 hours.  Once they've settled for a few weeks, and assuming they 
> don't have complex dependencies, they will get merged to RELENG_6. 
> Presumably if there is sufficient demand, and they adequately address the 
> reports of deadlocks with quotas+snapshots, they could be merged to 
> RELENG_6_1 as an errata update.

The fixes seem to indeed correct all the deadlocks I was seeing.  I
don't have time to produce a 6.x patch now though, but it should be a
simple matter for someone else to do.

Kris
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